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The effect, on size, bandwidth, and gain of a resonant slot antenna, of inserting an array of series inductors is investigated. The results show that the antenna size can be reduced efficiently without an adverse effect on the impedance matching and antenna gain. However, as expected, the antenna bandwidth is reduced as a result of this miniaturization process. The technique was demonstrated using a standard and a miniaturized slot antenna and good agreement between simulations and measured results was obtained.